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Hello, I'm experienced in building 12V/48V Lifefo4 batt. systems, done for several applications. I'm planning to install a 10kva home PV system with ESS. Most inverter operate with high voltage DC battery power input to for hybrid mode. I can't find information to DiY solar storage batteries...

I've the exactly the same issues and looking for solutions. I believe contact to the seller is mandatory to get proposal for Resolution actions. Waldemar

Consider the following solution: 1. Grind a slot hole in the decklid. 2. Use a copper bar, square dim. (20x5)mm and S- bend the bar. 3. Prepare the bar for the brass studs and drill sunk holes into the bar for upper and lower stud connection. 4. Flame solder brass studs at one end of the bar. 5...

I've tested the assembly in high current condition, in step function, up to 100Amps for about 40min. As liad I uaef an inverter with a heat gun. While testing I measured the heat disipations on wiring and connection surfaces. The FET's only marginaly heated up, I did expect more. This was fone...

Looks good to me. On my JBD Smart BMS board the balance delta voltage is set to 50mV, triggered from 3400mV.

I drained the affected cell from 3,51 volts to 3,35 volts, diff. 150mV, in a controlled way and burned only 1,5 AH off. I expected more energie to get burned. I've no experience to determine weather this is surface charge only and in an expected range. This brought all cells to the same voltage...

I agree yo change the parameters when the pack gets installed in the RV. However, this is a math exercise! When one of four cell reaches OVP at 3,65V and is 150mV ahead, the other cells are at about 3.45 - 3.50 Volts. My question is what can I do to reduce the spread and minimise the drift? In...

Hello, I'm building a 4S battery pack with CALB cells and a smart JBD 4S BMS board. I received the cells as grade A ( new), all showed the same voltage level of about 3,2 Volts. I'm currently in a working stage to lab' test the components and functions, battery and BMS. To condition the cells I...

The battery cells are connected in series, thus the current doesn't change and remains at 280amps for 1C load , the cuircuit voltage adds up and multiplies x4 per cell.

Hi Silos, battery shown in the Image have single BMS"s for one cell with OVP/UVP protection, wired in series as a Daisy chain circuit. To switch load either MOSFET's or latching relays are required. LFP Ytrium battery (Winston) have a better acceptance for low temp charging...

NTC missing! I ordered a Smart BMS 4S LiFePo4 150Amp with temp. protection from ICGOGOGO. Unforunately the kit parts came without temp. sensor (NTC) and couldn't get the supplier to send me the missing part. Does anybody know the spec. data of the NTC incl. two terminal connector and tell me the...

There are a lot of application in the DIY LiFePo4 scene for RV's which uses SSR and they work out reliable. However, 100Amp seems to be max, as far as I know. https://www.faktor.de/relais-ssr-schuetz/solid-state-relay-ssr/ High current relays get used with two coils to split inrush- and...

The development company REC directs in his HP on business partners. One business partner, providing whole BMS kits for marine application, offers as well some solid latching relays with a detailed spec.

@ FILTER GUY this should modulate a permanant signal into a 100ms reset pulse for set/reset of latching relay. BTY, this infomation was provided by Astronom in a different discussion. http://www.rec-bms.com/datasheet/UserManual_BSLRD.pdf

From Will's part 2 Chargery video session my take out is as follows: Based on the measurements Will has taken the relay solenoid drains 740mA's permanently. This explains the noticed heat disipation. This indicates that the relay solenoid has only a pull-in current coil (in-rush), the amount of...

19 days for BLS to prepare for shipping 28 days for handling & shipping

I believe we're on the same page. I ordered batteries in Feb. via railway transportation. Port of entry in Europe was Poland. The shipper was UPS. All customs declaration were prepared at Shenzen shipping hub and became due at the receiving transportation hub in Poland. The only variable costs...

What I'm interested in is to understand the permanent current drain of the chargery SSR holding coil. I suspect this might be a couple of hundred milli amps, I'd like to avoid permanent drain in a RV application. This would be my rejection criteria for this system. Keeping this in mind I can't...

DDP includes custom fees into your buying price, regardless for the shipping methods, sea, air freight or railway. As the customer you have the joice if you'd prefer the service by the shipping company for custom declareation or you want to declare customs yourself. No service is for free.

Why should import tax via Czech Republic as first border vountry into the EU less? Import tax into the EU is calculated on final destination EU Country.

Basically I see two different designs on the market. LFP with aluminium case and LFP with nylon case. Alu case design batt's are lighter and smaller in package compared to the nylon case batt's from CALB and Sinopoly. I'm interested to view on the pro's and cont's for RV application!

12V 260 Amp bi-stabile latching relay.

This is one BMS with triggers a 200ms negative signal or OVP/UVP for the charging and discharging loop. https://www.litrade.de/shop/BMS,Balancer/BMS,Systeme/Litrade/Balancer,Equalizer,Protect,V3,2,4,8,Zellen,12V,24V,3,5A.html I talked to the shop owner, located in Germany, the owner is an...

12 V two coil latching relays are available on the market between 100 - 200 Amp used on Lifep04 BMS application ifor RV's in Europe. I've seen application where two relays were connected in parallel to double the current draw. Installation works reliable. The issue is to find a BMS that sends a...

I bought a smart BMS board with Bluetooth advice and UART box with some other parts from AIiexpress, IC GOGOGO Store. 4S 12V Lifepo4 150A Continuous Lithium 3.2V Protection Board Bluetooth APP Computer UART Communication Balance Smart BMS...

Hi Danny, I ordered this BMS with bluetooth unit and UART box for set up. All came w/o decription or instruction manual. Provided bluetooth app is in Chinese. Did you manage to get decent manuals for set up for all three units? Waldemar

No objection! The point I wanted to make is, that lithium battery technology is available to protect for low temperature malfunction. What I don't understand is why the Ytrium chemestry technologie doesn't get more spread into the market? There might be design protection issues I don't understand!

Hold on! The market in Germany in Marine Service for Sail boats and power boats and RV DIY application service shops is with Y-chemistry LifeYPo4 (ThunderskY/Winston cells). My reviews and research on this showed that this is purley due to the better low temperature profile performance. When I...

I wish you a good day! I received 4 x battery cells, Lifepo4 CALB 3,2V 200Ah, from Aliexpress today. The battery cells came with copper busbars. The busbar profile is as shown in the images above with a yellow shrink sleeve. The busbar is made of three thin layers, the entire thickness is...

@ filter guy Thx for providing the links. I was after the top parallel balancing video Will pubished a while ago, however, my initial request was misleading on this -sorry for that- Meanwhile, I fully read and digested the entire parallel balancing thread and believe that I'm up to date on...

Can somebody please provide the link to Will's video clip on DC to DC charger balancing. Unfortunately I cant' find it in the table. I believe the video comments on 'gostwriter66' contribution to the step by step balancing method with DC charger I read a while ago somewhere in the forum. Thank...

Between the cells I slip small corrugated platic sheets which provides an air insulation to protect the cell housing from exessive heat transfer when battery cells heat up during high current dis-/ charge operation. I use a slot in the plastic sheets to stick the heat pattern elements. The main...

My strategy is low temperature avoidance. Although the BMS is controlled with a low temp. sensor I'm gonig to install a temp. control unit which connects three silicone heating pads located in between the cells in order to avoid low temp condition in an isolated battery box. Aim is to avoid low...

My point of view is that 100AH and 200AH cells units is the nominal spec. capacity. Capacity rates lower than nominal are cycled cells and not grade A anymore. This explains the big difference in price versus nominal. Chinese sellers won't tell you in chat communication up front about this. You...