44v vs 88v effect on mppt.

[Brian53713]

When cold weather is over, is there any advantage using panels at 88v vs 44v, for an evil 12v agm bank ?

[SunEagle]

When cold weather is over, is there any advantage using panels at 88v vs 44v, for an evil 12v agm bank ?

Anytime you have a higher voltage from point A to B you can have longer cable runs.

Also an MPPT that can accept a higher DC voltage allows you to wire the panels in series instead of parallel which can eliminate the need for over current protection by having a max of 2 "strings".

[jflorey2]

When cold weather is over, is there any advantage using panels at 88v vs 44v, for an evil 12v agm bank ?

If the panels are very close to the charge controller, you gain efficiency by having a panel voltage close to the battery voltage.
If the panels are far from the charge controller, you reduce losses by running at a higher voltage (and thus a lower current.)

[Sunking]

Given the choices and the fact you are using 12 volt battery, 44 volts is the right choice.

[Brian53713]

8 AWG mc4 50 feet distance, 100v mppt. Is what I should have included.

[Sunking]

8 AWG mc4 50 feet distance, 100v mppt. Is what I should have included.

Means nothing without panel specs and configuration. Need Vmp and Imp of your panel array.

[Brian53713]

4 x 100w, 22.5 voc,18.9vmp,5.29A Imp , .100/30 victron mppt. Using mc4 branch connection for cold weather to take to 44 ish. Just wondering for warm weather if use 88 ish is recommended for evil12v bank.

[Sunking]

4 x 100w, 22.5 voc,18.9vmp,5.29A Imp , .100/30 victron mppt. Using mc4 branch connection for cold weather to take to 44 ish. Just wondering for warm weather if use 88 ish is recommended for evil12v bank.

44 volts is all you need to know. Wire your panels 2 x 2 and stick a fork in it. Your done.

[Wy_White_Wolf]

4 x 100w, 22.5 voc,18.9vmp,5.29A Imp , .100/30 victron mppt. Using mc4 branch connection for cold weather to take to 44 ish. Just wondering for warm weather if use 88 ish is recommended for evil12v bank.

You need to compensate for cold/high voltage conditions.

22.5V * 4 * 1.25 = 112.5V

To high for your 100V MPPT charge controller.

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