SiO2 Battery -UPDATE 5 (Two Batts)
Updates 22 Oct, 8 Nov, 10 Nov (photo), 14 Nov, 15 Dec http://azimuthsolar.ca/product/12v-100ah-sio2-battery/ Mostly PT has given info on these over several posts in several threads, but I have l...
Forum Discussion
The MW draw vs battery AH has two things:
1. the discharge rate wrt what the battery is designed to handle without harm (I think I warped the plates of my AGMs from that)
2. the voltage drop that will alarm off the inverter.
A pair of 6s will keep the voltage above 11v alarm down to about 75% while four will let you keep the MW on till about 50% SOC.
A MW draw of say 120 amps on 235 AH bank is just too high for ordinary batteries. 120 amps on 470AH is ok.
The SiO2 feature I am using it for is that it can take a high discharge rate. It even holds its voltage up fairly well, but not as well as Li batts do down to low SOCs.
That feature means you can do big draws in the TC with SiO2 where there is limited space for batteries, such as four 6s.
Same thing with Li for that plus an advantage in being of lighter weight that might matter in a small RV. However, the Li is way more expensive and it has the cold weather issue to be overcome (heat pads or whatever) Also it has the BMS to complicate things, which SiO2 doesn't need.
You have to get your priorities straight with all that money at stake. Most folks don't need Li or SiO2 to get the job done. If the TC we got were not so awkward for battery space and inverter space, I would have been able to do the job with ordinary batteries. Way I look at it now looking back at buying this TC, it just adds to the initial (low) cost.
Rationalizing after the fact is the way to stay sane. :)
1. the discharge rate wrt what the battery is designed to handle without harm (I think I warped the plates of my AGMs from that)
2. the voltage drop that will alarm off the inverter.
A pair of 6s will keep the voltage above 11v alarm down to about 75% while four will let you keep the MW on till about 50% SOC.
A MW draw of say 120 amps on 235 AH bank is just too high for ordinary batteries. 120 amps on 470AH is ok.
The SiO2 feature I am using it for is that it can take a high discharge rate. It even holds its voltage up fairly well, but not as well as Li batts do down to low SOCs.
That feature means you can do big draws in the TC with SiO2 where there is limited space for batteries, such as four 6s.
Same thing with Li for that plus an advantage in being of lighter weight that might matter in a small RV. However, the Li is way more expensive and it has the cold weather issue to be overcome (heat pads or whatever) Also it has the BMS to complicate things, which SiO2 doesn't need.
You have to get your priorities straight with all that money at stake. Most folks don't need Li or SiO2 to get the job done. If the TC we got were not so awkward for battery space and inverter space, I would have been able to do the job with ordinary batteries. Way I look at it now looking back at buying this TC, it just adds to the initial (low) cost.
Rationalizing after the fact is the way to stay sane. :)
