Trojan T-105s Capacity?

[Tim Good]

Gosh I'm going round the houses here! Had a very long and informative discussion with Will at Sterling. Very knowledgeable. Clearly he rates their lithium batteries best with BMS shutdown technology which apparently makes them super safe. Anyway he was also very complimentary about T105s.

I have 4 x Bosch 105ah batteries = 420ah.

2 x Trojan 225ah (c20) = 450ah.

So the only 2 T105s do more than my 4 sealed acid batteries plus they claim they can happily work to 80% discharge without being damaged too much.

Have I got my sums right? 2 batteries doesn't seem like much but technically it is slightly more than I currently have which seems to be sufficient whilst carrying 360w of solar also.

 

[macd]

1 x T105 gives 225Ah at 6 volts.
2 x T105 gives 225Ah at 12 volts if wired in series (or 450Ah at 6V if wired in parallel).

In other words you need 4 x T105 to be roughly equivalent to the Bosch jobs.

 

[Tim Good]

1 x T105 gives 225Ah at 6 volts.
2 x T105 gives 225Ah at 12 volts if wired in series (or 450Ah at 6V if wired in parallel).

Of course... sorry i'm an idiot.... Too many number flying around at the moment.

 

[pvb]

Of course... sorry i'm an idiot.... Too many number flying around at the moment.

Just to add to the complications, it's worth noting that Trojan state Ah capacity at a very high 27degC ambient temperature. At, say, 10degC the capacity will be around 20% lower. I've no idea what ambient temperature Bosch rate their capacity at.

 

[Tim Good]

Just to add to the complications, it's worth noting that Trojan state Ah capacity at a very high 27degC ambient temperature. At, say, 10degC the capacity will be around 20% lower. I've no idea what ambient temperature Bosch rate their capacity at.

I'm half tempted to just replace what i have like for like. Fitting 105s means I rebuild of my battery boxes and a load of additional cabling. ***groan***

 

[Plevier]

Just to add to the complications, it's worth noting that Trojan state Ah capacity at a very high 27degC ambient temperature. At, say, 10degC the capacity will be around 20% lower. I've no idea what ambient temperature Bosch rate their capacity at.

25 Deg C is almost universal.

 

[Richard10002]

they claim they can happily work to 80% discharge without being damaged too much.

It may be all very well discharging to 20% SOC, (80% discharge), but you have to recharge them to 100% same day, otherwise sulphation starts to set in, and capacity reduces quite dramatically.

Discharge them to 20% SOC over a period of, say, a week, before charging them, will kill them in short order.

How do I know????