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  1. Pappion

    PV Disconnect for 600W Array ( 60 V @ 10 A )

    I can turn off my Victron Smart Solar via Bluetooth. That removes the load and current. The old TT had ground mounted panels, about 48v. Just throw a towel over it before removing extension cord.
  2. Pappion

    PV Disconnect for 600W Array ( 60 V @ 10 A )

    I used these in the old Travel Trailer. DZ47-63 2 Pole 20A 400V Did not like them. Not good at holding a wire. Would rather crimp connections.
  3. Pappion

    Solved: Epever 4210AN not connecting to laptop

    Looking thru this old thread.... Seems the Baud is being set, not mentioned: # of bits, stop bit, parity COM Port settings must match the target device: 115200 baud, 8 bits, 1 stop, no parity COM Port should be #1, but use 2,3,4 if they work. Confirm by doing the quickest and simplest thing...
  4. Pappion

    School me up on BMS in LiFePo4 please

    The BMS FETs have a inherit Body Diode, it still conducts when FETs are off, in one direction, albeit with a 0.7v to 1.2v drop. The 2 Banks of FETs are placed Back to Back, if both banks are off it is definitely off. If 1 Bank is off, it can have the Body Diode voltage drop in one direction, and...
  5. Pappion

    School me up on BMS in LiFePo4 please

    The BMS acts like a big electronic switch. Can shut down charging and discharging. Cell voltage imbalance can shut down charging. Low voltage can shut down discharging, maybe both. Temperature sensor can shut down both. Overcurrent can shut down discharging, maybe both. There is a slower...
  6. Pappion

    School me up on BMS in LiFePo4 please

    I had a WFCO 9855 in my old TT. With DIY 200AH and 280AH DIY LiFePO4 batteries and solar. It all played well together. Sometimes I didn't bother to put the heavy solar panels outside on the ground. After 48hrs the WFCO 9855 would drop to 13.2v storage voltage. There is a trick to getting back up...
  7. Pappion

    12vdc watt meter to monitor usage over time

    Close but no cigar. The powerex watt meter has no Restart Button. Only counts Wh from last startup. Also no daily clock and several day history.
  8. Pappion

    12vdc watt meter to monitor usage over time

    Plenty of DC shunts available. Nothing found with daily KWH, like my AC kilowatt hour meter.
  9. Pappion

    12vdc watt meter to monitor usage over time

    I'm interested too. I have been using the bluetooth battery shunt to estimate. No history data.
  10. Pappion

    Eaton AMX and AMH Fuses alternative to Class T

    I found LET fuses for $11 US. Never did find a fuse holder for it. Size changes with amperage. Just like LMT.
  11. Pappion

    Who is still building DIY batteries

    This Hammer Lug Crimper worked well with a 3lb sledgehammer. Only $14. Hammer Lug Crimper Secure it to a bench or sizeable piece of wood. Sometimes after a crimp, I turn it over and crimp again. Only used it for 8awg, 6awg, and 4awg. Rated for heavier gauge.
  12. Pappion

    Mppt controller help

    What is the IMP on the panels label? 400W / 36V = 11A. 2S would still be 11A, but at 72V 2P would be 22A. 2S2P would be 22A, but at 72V MPPT works like a DC-DC transformer. So 400W output at 14v = 28A, 4x that is 114A. (half for 24v battery, half again for 48v) It's OK to be over wattage on the...
  13. Pappion

    Smart shunt not showing soc

    Right, it does not charge. Lead acid will have a higher Peukert Exponent, lower Charge efficiency factor. Lower charge voltage and higher Discharge floor. Victron will guide you thru it.
  14. Pappion

    Regulated DC into MPPT controller?

    Know your MPPT. Some are positive ground (regulating between negative terminals), not compatible with negative ground DC-DC booster. If you want to play... use voltage appropriate fuses.
  15. Pappion

    voltage being throttled down ?

    What are you using for panel connectors? My cheap MC4 had contact pins would not stay locked in place. Epoxy fixed it. SAE are terrible. The barrel side has a split that might need an occasional squeeze. Use a contact cleaner/dressing. Also check for worn/stretched wires near the connectors. Too...
  16. Pappion

    Solved: Limited IQ8+ inverter output - JA Solar panels rated for 395 Watts putting out 250 watts (63% of max rated)

    The sun has to shine through more atmosphere to reach Minnesota in the winter.
  17. Pappion

    What is my shunt actually for, if my BMS also has internal shunt?

    links? I can find Victron CCGX. No Idea what Venuspi is. By BVM do you mean a Victron BMV product?
  18. Pappion

    What is my shunt actually for, if my BMS also has internal shunt?

    I wish my Victron Smart Shunt app had the same type of daily history data as the Victron Smart Solar app. Maybe the wired system is better.
  19. Pappion

    What is my shunt actually for, if my BMS also has internal shunt?

    That is a Big IF. My BMS (Overkill Solar and Radio B) uses voltage to show State of Charge. You can set it under parameters, in 20% increments. Current reading is not accurate or precise enough in both directions. Most likely it is based on the voltage drop across the power FETs, not a stable...
  20. Pappion

    20 amp controller vs 10 amp Furrion inlet port for camper RV

    I used MC4 bulkhead. Also considering XT90 panel mount. MC4 panel mount with connectors note: The one I used is no longer available. XT90 Panel Mount High current gold platted contacts. It has a weather seal plug. In all cases Be Safe. Wet connectors can be shocking. MC4 is much safer than the...
  21. Pappion

    Questions on upgrading solar on travel trailer

    24v would be easier than 48v. More selection of inverters, solar controllers, and DC-12VDC converters. DC can sustain an arc, so the selection of a 48v (58v) battery cutoff switch needs attention. Same for fuses. As for batteries, series wiring is not ideal. Battle Born will sell you a matched...
  22. Pappion

    Who is still building DIY batteries

    What did you use for a fuse holder?
  23. Pappion

    Who is still building DIY batteries

    What did you use for a fuse holder?
  24. Pappion

    Who is still building DIY batteries

    Inside my DIY batteries, with 100-125A BMS, I have 150A ANL fuses. Wish I knew about LET fuses, 160A max. Seems better than Class T and only $11-$15 USD. But I can't find a fuse holder. 1/4 wide slotted holes. Can be soldered down. Maybe alter an exsisting fuse holder.
  25. Pappion

    Looking for a small MPPT SCC

    I have 2ea 250w panels for portable ground mount for RV. I place them facing slightly different. One catches morning/noon sun and the other noon/evening sun. Works good for partly cloudy day. Full output is rare, so less wire loss, and no over paneling of SCC. Long ago I had tried a Genasun...
  26. Pappion

    BMS choices for 12V 4P system

    Have you considered a 24v system? It's much better for inverters over 2000 watts.
  27. Pappion

    Are equipment-supplied cables really big enough for 100A?

    Blue Sea Wire and fuse The Blue Sea wire and fuse chart is handy to have. The 4awg looks ok, depends on the insulation. The resistance calculates to 0.002 ohms, for 10ft round trip. 0.2v drop at 100amps. calculator
  28. Pappion

    BMS choices for 12V 4P system

    I have built 2 4S LiFePO4 batteries. I used two brands of identical BMS: OverKill Solar and RadioB. They have a passive balancer. After being idle and offline for a month they went out of balance and when a cell was high they stopped charging. It took 5 daily cycles to restore balance. One...
  29. Pappion

    8 AWG wire into 10 AWG terminal...

    I have: Split the strands into two bundles and put a crimp terminal on each one. Did not have terminals large enough or a larger crimper or room to fit the larger crimper. Also in your case you may be able to use more than one terminal on the block.
  30. Pappion

    Fusing batteries in parallel

    IMHO: That much power should be 24v. Seems to me you want to run a substantial Inverter, >2000W. 24v being half the amps will save you some copper and the wire voltage drop will be a smaller % loss to the inverter. Victron has 70A DC-DC (24v to 12v) converter that can power an RV 12v backbone...
  31. Pappion

    LET Fuse Blocks

    I am looking at 80A LET fuses and 125A LET fuses. I can't find a fuse block in USA. The LET can be had a lot cheaper the Class T and still have a large 50K AIC DCV. The mounting holes are elongated with a .255" width, and 0.38" length. So. 1/4" post. Hole center to center is 1.6" I'm looking a...
  32. Pappion

    Would someone mind looking over my system and comment on any errors before I power up?

    2 lifepo4 in series is not optimal. Battle Born will sell matched sets for that. Better to buy ready made 24v lifepo4 batteries. 2S3P panels - six (260W, 30.6V, 8.5A). : 3 or more in parallel should have a fuse for each string. Issue is with one string shorted the others will dump to much...
  33. Pappion

    AGM short circuit current, what fuse do I need?

    Blue Sea system MRBF 80A is rated 58v MRBA 80A buy quality.
  34. Pappion

    AGM short circuit current, what fuse do I need?

    I prefer fuses. CBs get hot and waste power. Lots of discussion here about the cheap ones being so bad in so many ways. Avoid cheap Chinese. Make sure it is rated for DC and your voltage. DC arcing is difficult. AC goes thru 0v and may self extinguish.
  35. Pappion

    AGM short circuit current, what fuse do I need?

    oops you missed my update with MRBF.
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