Ekstra batteripakke i saxo

[Trygve B]

Noen som har prøvd å montere inn en ekstra batteripakke med originale nicad batterier, eller har meninger for og imot dette?
Går med tanker om å sette inn en ekstra 6er kasse i bagasjerommet, muligens med litt mindre enn 6 batterier hvis dett viser seg å bli for tungt

[Elmo]

Noe særlig mere enn 2-3 original-batterier ekstra tror jeg vil skape problemer for "logikken" i bilen.

Jeg vet at VWspirit kjører med 2 ekstra batterier i en 3'er kasse i bagasjerommet, koblet i seriemed originalpakken. Han har montert en liten motstand på tempføleren (etter råd/oppskrift fra Pera L (tror jeg det var)) for å lure elektronikken til å lade nok.
Men Maint Charge programmet stopper så batteriene må kobles bort for å få gjort vannservice. Og så må ekstrabatteriene "vannes" separat.

Selv kjørte jeg med med 120v/30Ah lithium-pakke i bagasjerommet et års tid - koblet i parallell med originalbatteriene (se egen tråd). Det gikk veldig fint på alle måter inntil BMSen i et par av batteriene smeltet. Jeg har fått nye av leverandøren, men ikke fått tid til å koble pakken inn igjen.

PS: jeg vet jeg burde skrevet noe om problemene i den tråden, men har glemt det

[Pera L]

Hej! One or two extra batteries is ok for 106/Saxo. Not need to disconnected when doing watering charge because the system not watching the voltage then, just charging some three, four hours with smaller current.
In my P106E the charging system rises voltage for some 170-173V normally charging and it means 8,1-8,24V per battery if there is 21pcs. And because there is automatic balancing charge after some 10 to 20 normal charge it is ok.

About extra battery pack, I have in my mind some 4pcs 160Ah LiFePo4 connected to series and inverter, 12VDC/120VAC 1500W continuous, and bridge rectifier and some small value balancing resistor series. Then it's possible to empty them to the car batteries with reasonable time. Also pack is quite handy to take to the car if needed. It also means about 2kWh more electric. 230V inverter is suitable for Berlingo/Partner.
Bridge rectifiers like 1000V 50A are cheap and uses mostly switching diodes. Cheaper inverters produced square wave and switching diodes like it, very low heat emission. Serial resistor can be matched with 100V (20V difference) because car does not allow lower voltage. Normal 12V charger can be use to charge extra batteries. Also it's easy to build, doesn't need generations to get ready...

Best regards
Pera L

[Elmo]

Hej! One or two extra batteries is ok for 106/Saxo. Not need to disconnected when doing watering charge because the system not watching the voltage then, just charging some three, four hours with smaller current.
In my P106E the charging system rises voltage for some 170-173V normally charging and it means 8,1-8,24V per battery if there is 21pcs. And because there is automatic balancing charge after some 10 to 20 normal charge it is ok.

I agree about the theory, but I just know that on the 106 I am talking about the normal Maint-Charge program stops to early, unless we disconnect the two extra batteries.

[Pera L]

Interesting! Have you tried with equalisation or init charge? After normal charge it need just 3 hours charge with one of those and the electrolyte level is on the max. It's not a matter about current, 5A init, 7A with equalisation or 8 to 10A with watering/maintenance charge. Effect is the same.
Must try to use 4,7kohm NTC instead of radiator NTC, maybe it's working better.

Berlingo with 3 extra batteries can do easily the job, voltage will rising somewhere to 247V and it means with 27 batteries 9,1V per battery and with three extra batteries (30pcs) 8,2V. In practise, you have 18kWh plus rising the voltage effect with the less current, some 20kWh usable battery capacity instead of 16kWh... if driving habits are the same. But car is so willing to go so when the traffic lights go to green...
Must say that in the wintertime is better use just two extra batteries in Berlingo because it's very hard to get batteries full when ambient is lower than -10C.

Best regards
Pera L

[Elmo]

Must try to use 4,7kohm NTC instead of radiator NTC, maybe it's working better.

VWspirit have already installed that, after advice from you

Interesting! Have you tried with equalisation or init charge? After normal charge it need just 3 hours charge with one of those and the electrolyte level is on the max. It's not a matter about current, 5A init, 7A with equalisation or 8 to 10A with watering/maintenance charge. Effect is the same.

Next time I will try with external (homemade semi-fast-) charger.

Actually one of my own cars have had the same problem the last to wathersevices - ie. that neither Maint- nor Init-charge continues after 100% is reached, so then I have continued with 5A from external charger until electrolyte level is ready for wathering.

[Pera L]

Hmm. Ok. This must be solved, I'm gonna do some research and will back for this. I have one P106E -00.

Hälsningar
Pera L