Shunts & SOC

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My RE system: Vfx3524, two Flexmax 60s, three Flexmax 80s, Mate3s 12kw solar panels. 12 2v AGM 900AH batteries, 24 12V AGM batteries on two auxiliary systems that consist of Flexmax 60s, two stacked TRACE 1500 Watt inverters and one 3600 Watt TRACE inverter with exra true sine wave inverter. The stacked inverters run the well pump for pasture, garden and house. The 3600 Watt inverter powers the shop.

Shunts & SOC

Post by Jeremiahlyon » Sat Jan 04, 2020 12:43 pm

I have an off-grid system consisting of:

24V system

6KW PV array

2 each VFXR 3524 inverters (not stacked)

3 each FM80 charge controlers

12 900AH AGM Batteries 2.5 years old

2 shunts

One shunt is between battery negative and the inverters.
The other shunt is between battery negative and the controller negative.

The shunt between the batteries and the inverters reads a negative value and the shunt between the controlers and the battery reads a positive value.
Is this correct? I expected both shunts to read negative values. See attachment.

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My RE system: FX3048, 4 200a batteries, FM60. 3 kw array

Re: Shunts & SOC

Post by EMCF » Sat Jan 04, 2020 1:01 pm

The shunt readings are showing correct readings. When the shunt on inverter shows positive reading, it means the inverting is charging the battery. When the shunt for the CCs shows negative reading, that means none of the CCs are doing any charge and just showing the idle current consumed by the CCs.
Outback Fanboy at your service

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