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GreenMan

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  1. Ah, i meant overall efficiency of the system and not purely PV efficiency. My guess is that the PV efficiency is dependant on the MPPT firmware and hardware ? Just guessing.
  2. Hi Bain Also in terms of overall efficiency, remember the King inverters operate (when not bypassed, obviously) in Online mode (in UPS speak). That is why you have zero transfer time to battery when there is a mains failure. This means that the inverter is always inverting and there is the inefficiencies of this as the DC is converted to AC.
  3. Hi Bain For the King, choosing ECO mode diverts all solar power to the batteries and never to the load except if there is a mains fail then batteries will supply power to load. Once the batteries are full then the PV power generated drops to zero ! Your current CPU version 71.90 has a known bug that even if you selected in Question 16 the option of Udc (don't charge batteries from the grid) the grid still charged the batteries at a small current. This is much less than if you had the inverter in ECO mode but where the full PV power would charge the battery. I upgraded to 71.92 (not for the faint hearted as one is so poep scared to brick the inverter...). This should have fixed the above Udc charging problem but the grid still charges the batteries albeit at a reduced current to before. Their is another thread on the forum about flashing the CPU where @Coulomb has given lots of valuable advice. I used the USB OTG method. My additional advice to what has already been shared is to be patient while the upgrade is in progress (just wait the 10 minutes or so) when upgrading and don't interrupt it like i did. Then you get error 32.... and subsequent headache. PS my 6.1 kWH battery is doing well
  4. Hi NightByte From a voltage point of view it would be fine as the unit I have is definitely a 15S unit to match yours which you say is a 15S. You need to confirm this as there are some Shotos that are 16S (which is better than 15S). I think Coulomb mentioned that the BAKs are 16S. It is not ideal to mix battery capacities but can be done as the Pylontechs can be bought in a similar non matched configuration (i.e. 2.4 and 3.5 kWH). As the batteries will be connected in parallel the voltage will be same across both batteries.
  5. With lead acids in series (in fact any series arrangement of cells or batteries) you run the risk of getting an imbalance. This imbalance will never correct itself and will just keep getting worse typically with the weakest bugger getting weaker and weaker... That is why Victron have a LA battery balancer product and the midpoint monitoring feature in the BMV 702/712 so that you can get an early warning. A cheap solution is to get 4x voltmeters and hook them up (check calibration first) so that you can see at a glance what the voltage on each battery is. They consume negligible power so you could just leave them on permanently. Something like this will work nicely https://www.communica.co.za/products/dpm-dig-volt-meter-4-5-150v-red I have (like Coulomb) heard so many tales of premature failures of LA batteries. One of my mates put in 4x 200AH before lockdown and (with correct charging parameters). A week ago he is finding that they look like they have lost a lot of capacity. Without a AH capacity checker it is difficult to check for him. I have seen some nice ones on AliExpress which would be very useful.
  6. Hi Shockin I don't know how old it is. I got it in March this year from someone who had it previously. He sold it because it did not work properly for him as he was trying to get it to add it to his existing bank of 2x Shotos (I saw them at his house) It did not work as his installed Shotos are 16S and this unit (like Pylontechs) is 15S. A postive of buying a (used) battery with a BMS is that they are sort of idiot-proof. It is difficult to damage them from overdischarge; overcharge; over current; over temperature etc. If we had a system that could talk to the BMS (the Shoto does have RS232 and RS485 communications ports) then we could get the information from the BMS.... Sadly this communication has not been done yet and I have tried to find it on the internet; I tried emailing Shoto Africa representative listed on the Shoto website but no replies. I see on the forum there have been a few posts between ICC and forum members regarding getting the units to talk to ICC but it does not seem that this has been done yet. This is a pity as the Shoto units are quite solid.
  7. Hi Robert The Pylons contain pouch cell and are not filled with a liquid electrolyte so you can mount in orientation obviously the battery to battery links will need to be long enough. Prismatics, from what i have read, should be mounted with the air vent facing upwards. Regarding the warranty, in the unlikely event that you had to return it, they would be unaware that the battery had been mounted vertically ? If you look at the Dyness "Powerwall" type wall mounted solution you will see that those batteries are mounted vertically e.g. https://www.ellies.co.za/product/dyness-li-ion-powerbox/
  8. Item: Shoto SDA10-4850 48V 2.4 kWH LiFePo4 Battery. As per image below, except the clear plastic cover over the terminals is missing. Location: Jhb near Eastgate shopping centre. Reason for selling: No longer required as have upgraded to Bain's 6.1 kWH battery https://lithiumbatteriessa.co.za/ Shipping: Preferably not. Price: R12k slightly negotiable. For more product info: Google it eg https://www.solardeals.co.za/solar-batteries/shoto-sda10-4850-2-4kw-48v-detail or https://www.sustainable.co.za/shoto-sda10-4850-50ah-48v-lithium-battery.html
  9. Plonkster would like this suggestion.... Have you thought of installing a Victron BMV (includes shunt) onto your system which would give you accurate and reliable data... Am just busy ordering a BMV700 to connect to my ICC/Pi. Don't need the mid-point voltage monitoring or bluetooth so don't need the more expensive bigger models. It is a small price to pay to add to your system which has already been a significant investment for you. Oh yes to connect the BMV to the ICC and Pi you would also need the Victron USB to VEDirect cable. What says Plonkie ?
  10. Price drop.... R750 ! See https://www.batteryexperts.co.za/shop/benton-bx-1m-3-8ah/ Note the picture shown on the website is the wrong one - the previous model which does not charge lithiums. The new improved model like the one i have is black and not grey.
  11. Hi Blue Planet Power Do you know who the distributor is for Shoto in Jhb ? I need to check if a SDA10-4850 is still under warranty as the capacity seems low.
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