mttb controller

[Chopperbob]

What's the best value in a mttb solar controller with
A 540w system, 4 gc 6v batts?
Bob

[pianotuna]

Hi,

If you are using nominally 12 volt panels it does not make much (financial) sense to use an MPPT controller.

[Almot]

EsoxLucius wrote:

I think the best choice is as I stated previously, the Morningstar TS-MPPT-45.

Ditto.

[EsoxLucius]

The Blue Sky SB3024iL will regulate 500 watts STC and 700 watts NOCT with a 12 volt system battery which means it is highly likely it will handle 540 watts 12 volt nominal PV under virtually all conditions. I have 500 watts PV with the 3024iL currently and am thinking of adding another 100 or 135 watt panel. It is true that with 24 volt nominal PV the SB3024iL (30 amps at 24 volts) will be limited to around 350 watts.

A Blue Sky SB3000i is not going to cut it with 540 watts.

I think the best choice is as I stated previously, the Morningstar TS-MPPT-45. Doing it right the first time usually saves money in the long run.

[Almot]

According to the manufacturer Bluesky 3024 is 40A at 12V. Not that I doubt what Don said - he has this unit, I don't.

Anyway, Bob mentioned model 3000 (3000i?), and those are max 30A @12V, and there is no 24V bank option.

[pianotuna]

Hi bob,

I have a blue sky 3024 di. It will NOT handle 540 watts. In higher voltage mode it will struggle to do more than about 350 watts. It does not have a battery voltage sense wire, and the temperature probe is an extra cost item.

Chopperbob wrote:
Im going with a blue sky 3000. It will float the batts.
Unlike the 2000 I have now.
Bob.

[Almot]

Rogue is the best 30A MPPT out there. Having said this, I think 30A is a little small for 540W solar.

Bluesky 3000, being same 30A as Rogue, is an odd choice for 540W, IMO.

[Chopperbob]

Im going with a blue sky 3000. It will float the batts.
Unlike the 2000 I have now.
Bob.

[EsoxLucius]

I'd consider the Morningstar TS-MPPT-45 controller with the TS-RM-2, voltage sense wire kit and battery temperature compensation. The Rogue 3048 might not be enough for a 540 watt solar array with a 12 volt system battery.

[pianotuna]

Hi,

Flat install? Rogue 3048. Possibly to use Tristar MPPT 45 amp as well--but be sure to use the battery temperature probe.