Check MPPT 75/15 with Bluetooth	Check MPPT 100/20 with Bluetooth	Check MPPT 100/30 with Bluetooth

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Victron MPPT charge controllers are one of the best solar controllers for charging lithium and lead-acid batteries. In fact, they can be set manually to charge any battery chemistry. This and more info you can find while browsing through the guide.
For example, Victron MPPT 75/15 unit shown above can operate with 12,24 and 48V battery sets, whereas SmartSolar 100/20 and SmartSolar 100/30 model are only compatible with 12 and 24V battery banks. Make sure to verify the charge controller operation voltage before purchasing a controller. There are many other models available in the market, do not hesitate to contact us if you need help selecting the right one. In this manual, we want to show you how to program Victron MPPT charging settings for lithium-ion and lead-acid batteries.

The example below reflects a 12V battery bank scenario, for the 24 and 48V systems simply multiply the 12V values by 2 and 4 respectively.

Step 1

Download VictronConnect App from App Store or Google Play Store, and create an account

Step 2

In the “Device List” look for the charge controller. It should say “SmartSolar”, click on the device image.

Step 3

The Bluetooth pop-up window should appear and you will need to type in the pin code. The default pin is 000000 (six zeros with no spaces in between)

Step 4

If the firmware update is available, click on the Update button below. Do not touch your phone while update is in progress.

Step 5

After seeing the main screen, click on the gear symbol on top right corner following by the battery menu

Step 6

After opening the battery setting page, select the appropriate battery voltage (12,24 or 48V).

Step 7

Go to the battery preset menu and select the appropriate type or chemistry

Victron MPPT charging settings are easy to follow. However, for those who are looking to setup the charging settings manually, the table below is a great source of truth. Also, you can use these settings while programming other charge controllers.

Setting	Lithium-ion battery 12V/24V/48V	Lead-acid AGM, GEL 12V/24V/48V	Lead-acid flooded 12V/24V/48V
Bulk/Absorption Voltage	14.4V/28.8V/57.6V	14.7V/29.4V/58.8V	14.8/29.6V/59.2V
Bulk/Absorption Time	30 min per 100Ah of LiFePO4 battery	0.42 x Capacity / Charging Current (e.g. 0.42 * 300Ah / 30A = 4.2 hours	0.42 x Capacity / Charging Current (e.g. 0.42 * 400Ah / 50A = 3.4 hours
Float Voltage	13.5V/27V/54V	13.6V/27.2V/54.6V	13.5V/27V/54V
Equalization voltage Equalization Time		14.7V/29.4V/58.8V	15.8V/31.6V/63.2V 2.5 hours
Temperature Compensation		-4mV/°C/cell	-4mV/°C/cell
Low Temperature cut-off	3° degrees Celsius

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Overall, adjusting up the battery voltage is the initial step in setting up the system. It’s important to properly maintain the batteries to increase their lifespan and keep them functioning well.

12V Standard Battery & Solar Panel Bundles

	1x 100Ah AGM & 1x 100W Solar Panel & 1x 15A MPPT Controller (recharge time from 50% to 100% about 1.5days of sun hours)
	1x 100Ah Lithium-ion & 1x 100W Solar Panel & 1x 15A MPPT Controller (recharge time from 50% to 100% about 1 day of sun hours)
	1x 100Ah AGM & 2x 100W Solar Panel & 1x 20A MPPT Controller (recharge time from 50% to 100% about 1 day of sun hours)
	1x 100Ah Lithium-ion & 2x 100W Solar Panel & 1x 20A MPPT Controller (recharge time from 50% to 100% about 5-7 of sun hours)
	1x 100Ah AGM & 1x 300W Solar Panel & 1x 30A MPPT Controller (recharge time from 50% to 100% about 6-8 of sun hours)
	1x 100Ah Lithium-ion & 1x 300W Solar Panel & 1x 30A MPPT Controller (recharge time from 50% to 100% about 3-5 of sun hours)
	2x 100Ah AGM & 2x 100W Solar Panel & 1x 20A MPPT Controller (recharge time from 50% to 100% about 1.5days sun hours)
	2x 100Ah Lithium-ion & 2x 100W Solar Panel & 1x 20A MPPT Controller (recharge time from 50% to 100% about 1 day sun hours)
	2x 100Ah AGM & 1x 300W Solar Panel & 1x 30A MPPT Controller (recharge time from 50% to 100% about 1 day of sun hours)
	2x 100Ah Lithium-ion & 1x 300W Solar Panel & 1x 30A MPPT Controller (recharge time from 50% to 100% about 6-8 of sun hours)

Lithium-ion/LiFePO4

Lithium-ion batteries such as Universal 12V LiFePO4 or a well-known Renogy 12V Lithium have a relatively low self-discharge rate, meaning they lose charge at a slower rate when not in use. However, it is still important to store them in a cool, dry place and avoid overcharging or discharging them too much. In general, avoid discharging a lithium-ion battery below 20% of its capacity to prolong its lifespan and maintain optimal performance. A battery monitor such as BMV-712 Smart Battery Monitor can help extend battery lifespan by providing real-time information and programmable alarms to prevent overcharging, deep discharging, or exposure to extreme temperatures. Additionally, it can also track battery usage and performance over time to identify issues and allow to take corrective actions.

Check Victron BMV-712 Battery Monitor

Lead-acid

Lead-acid batteries, which are also commonly used in backup power systems, have a higher self-discharge rate. They should be stored in a cool, dry place and kept at a full charge if they will not be used for an extended period of time. It is also important to check the water level in the battery and add distilled water as needed. A battery hydrometer is a tool used to measure the health and charge level of a lead-acid battery. It works by measuring the concentration of sulfuric acid in the battery’s electrolyte, which can help diagnose issues such as overcharging, undercharging, or cell damage that may shorten the battery’s lifespan. Therefore, by using a battery hydrometer to check the health of your lead-acid battery, you can ensure that it is working at its best and potentially extend its lifespan.

Check battery hydrometer

The Swiss-made “HydroVolt” from Compaselect – a reliable and efficient battery perfect for any off-grid system. What sets this one apart is its built-in temperature compensation, ensuring it can perform optimally in any environment. One crucial factor to consider regarding batteries is the specific gravity. This is the ratio of the density of a substance to the density of a reference substance, typically water. In the case of batteries, it is a measure of the electrolyte’s state of charge. The full specific gravity values of 1.265 for the HydroVolt ensure that you have a battery capable of delivering consistent and reliable performance.

By applying a controlled overcharge, you can ensure that all cells are brought up to the same state of charge. However, over time, the cells of a battery bank can tend to drift apart, causing some cells to become overcharged and others to become undercharged. That’s when you need to equalize the battery bank. Setting up the charge controller to auto-equalize once in 3 months is essential to ensure that your battery bank is always in top condition. This will help maintain your batteries’ health and ensure that they last for as long as possible.

Finally, unless your batteries are in a spot where they see a relatively constant temperature year-round, it’s crucial to have a temperature sensor mounted on one of them and a charge controller that knows how to do auto temperature compensation. It will ensure that your batteries are always charged optimally, no matter what the temperature is like outside.

	Check Smart Battery Sens		Check Temperature Sensor

May the solar power be with you!

Hey, have you checked out the latest Sunnywell posts yet? By the way, if you haven’t already, make sure you don’t miss out on some of their other amazing content too!