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The charge controller sits between your panels and battery, and sizing it wrong is one of the easiest ways to damage a DIY system. The two numbers that matter most are the maximum PV input voltage, which your panel string’s open circuit voltage must stay below in the coldest weather, and the rated charge current. The five MPPT controllers below cover small 12 V setups up to 48 V systems. If you want more background, see DIY Solar Powered Light: Step-by-Step Build Guide for Beginners.
Every specification on this page comes from the manufacturer’s own product page, checked on 26 October 2026. We have not used these products ourselves, so the picks are based on published specifications only.
Not sure whether you need MPPT? Read MPPT vs PWM charge controllers first.
How we chose these
- MPPT, not PWM.
- Full electrical table published: rated current, maximum PV voltage and PV power per battery voltage.
- Lithium battery support stated by the maker.
- Enclosure rating and warranty given.
Renogy notes a recommended limit below the maximum PV voltage in low temperatures for its Rover Li. Panel open circuit voltage rises in cold weather, so leave margin below every controller’s maximum.
Comparison table
| Controller | Rated current | Battery voltage | Max PV voltage (Voc) | PV power (12 V / 24 V) | Enclosure | Warranty |
|---|---|---|---|---|---|---|
| Victron SmartSolar MPPT 75/15 | 15 A | 12/24 V auto | 75 V | 220 W / 440 W nominal | IP43 electronics, IP22 connections | See Victron |
| Victron SmartSolar MPPT 100/20-48V | 20 A | 12/24/48 V auto | 100 V | 290 W / 580 W nominal (1160 W at 48 V) | IP43 electronics, IP22 connections | See Victron |
| Renogy Rover Li 30A | 30 A | 12/24 V | 100 V (95 V recommended in low temperature) | 400 W / 800 W | IP32 | 3 years |
| Renogy REGO 30A | 30 A | 12/24/36/48 V auto | 150 V | 440 W / 880 W (1700 W at 48 V) | IP43 | 5 years (material) |
| Renogy Rover Lite 60A | 60 A | 12/24/36/48 V auto | 150 V | 900 W / 1800 W (3200 W at 48 V) | IP32 | 2 years |
Victron gives nominal PV power and both makers give per-battery-voltage figures; check the full table for your battery voltage. You may also like 7 Best Solar Hot Tub Heater DIY Kits and Parts for Every Need.
1. Victron SmartSolar MPPT 75/15: for a small 12 V or 24 V system
Victron’s 75/15 is a compact controller with Bluetooth built in, a load output that can disconnect loads before the battery is over-discharged, and a VE.Direct data port. Victron lists 98% peak efficiency and very low self-consumption: 10 mA at 12 V with the load output off.
- Max PV short circuit current 15 A; max continuous load current 15 A; weight 0.5 kg; 100 x 113 x 40 mm (Victron datasheet).
- Operating temperature -30 to +60 °C, full rated output up to 40 °C.
Pros: load output with automatic disconnect; Bluetooth built in; tiny self-consumption.
Cons: 75 V input limit restricts how many panels you can wire in series; 12/24 V only.
2. Victron SmartSolar MPPT 100/20-48V: for a small 48 V system
The 100/20-48V is the same family with a 100 V input limit, 20 A of charge current and 48 V battery support, where Victron lists 1160 W of nominal PV power. Like the 75/15 it has Bluetooth, a load output and adjustable absorption and float voltages.
- Weight 0.65 kg; 100 x 131 x 60 mm (Victron datasheet).
- Max continuous load current 20 A at 12 and 24 V, but only 1 A at 48 V.
Pros: 48 V support in a small unit; Bluetooth; load output.
Cons: load output is limited to 1 A on 48 V systems.
3. Renogy Rover Li 30A MPPT: for a mid-size 12 V or 24 V lithium setup
The Rover Li doubles the current of the Victron units to 30 A at a 100 V input limit. Renogy says it has a lithium activation function that can charge over-discharged lithium batteries, and it monitors through an RS485 port with Renogy’s optional BT-2 Bluetooth module.
- Max battery voltage 32 V; operating -35 to 45 °C (-31 to 113 °F); 238 x 172 x 77 mm (Renogy).
- Protection: overcharging, over-discharging, overload and short circuit.
Pros: 30 A for a 12 V or 24 V camper or cabin; lithium recovery; 3-year warranty.
Cons: Bluetooth needs an add-on module; IP32 gives only light protection against dripping water, so mount it somewhere dry.
4. Renogy REGO 30A MPPT: for 36 V and 48 V battery banks
REGO supports 12, 24, 36 and 48 V batteries and a 150 V input limit, which allows longer panel strings than the 100 V units. Renogy lists over 99% MPPT tracking efficiency and over 97% conversion efficiency, with presets for AGM, gel, sealed, flooded and lithium batteries plus a user mode.
- Power consumption under 0.57 W at 12 V; weight 2.7 kg; operating -35 to 65 °C (Renogy).
- Certifications listed: FCC, RoHS, CE, SAA, RCM, UL 1741.
Pros: 36 and 48 V support; 150 V input; IP43; longest warranty here.
Cons: higher self-consumption than the Victron units; heavier.
5. Renogy Rover Lite 60A MPPT: for the largest arrays here
The Rover Lite 60A is the highest-current controller here. Renogy lists 99% MPPT tracking efficiency, 97% conversion efficiency and self-consumption of 0.18 W in 12 V systems, and says it keeps full-load operation up to 149 °F with low-temperature protection below 32 °F for lithium batteries.
- Max solar input 900 W at 12 V, 1800 W at 24 V, 2000 W at 36 V, 3200 W at 48 V; 3.5 kg; 305 x 205 x 99 mm (Renogy).
- Bluetooth through the optional BT-2 module.
Pros: 60 A and up to 3200 W of PV at 48 V; low-temperature lithium protection.
Cons: IP32; shortest warranty here at 2 years; largest and heaviest.
Which one fits you
| Your system | Look at | Why |
|---|---|---|
| One or two panels, 12 V battery | Victron SmartSolar 75/15 | Small, efficient, load output |
| Small 48 V system | Victron SmartSolar 100/20-48V | 48 V support at 20 A |
| Camper or van, 12 V lithium, a few hundred watts | Renogy Rover Li 30A | 30 A with lithium recovery |
| 36 or 48 V bank, longer strings | Renogy REGO 30A | 150 V input, IP43, 5-year warranty |
| Large array on a 48 V bank | Renogy Rover Lite 60A | Up to 3200 W at 48 V |
Practical tips
- Add up the open circuit voltage of panels wired in series and keep it below the controller’s maximum, with margin for cold mornings.
- Follow the controller manual for fusing, wire size and the order of connecting battery and panels.
- Mount IP32 controllers indoors in a dry, ventilated spot; Renogy asks for a cool, dry, weather-safe location with space for heat dissipation.
Sources
Specifications from each manufacturer’s product page, checked 26 October 2026: Victron SmartSolar MPPT 75/15, Victron SmartSolar MPPT 100/20-48V, Renogy Rover Li 30A MPPT, Renogy REGO 30A MPPT, Renogy Rover Lite 60A MPPT. Makers can change specifications; check the product page before you buy.
