Manual Victron batterij monitor BMV 702 (page 328 of 334) (English, German, Dutch, French, Italian, Portuguese, Swedish, Spanish)

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mas as grandes diferenças vão originar danos durante o carregamento

devido à gaseificação excessiva das baterias com o estado da carga

inicial mais elevado.

É possível gerar um alarme oportuno monitorizando o ponto médio do

banco de baterias (ou seja, dividindo a tensão de cadeia a meio e

comparando as duas metades da tensão de cadeia).

Tenha em conta que o desvio do ponto médio será pequeno quando o

banco de baterias estiver em repouso e que aumentará:

a) no final da fase inicial da carga (a tensão das células com

carregamento correto aumenta rapidamente, ao passo que as células

com atraso precisam de mais carga);

b) durante a descarga do banco de baterias até que a tensão das

células mais fracas comece a diminuir rapidamente; e

c) com taxas de carga e descarga superiores.

5.2.1 Cálculo da % do desvio do ponto médio

d (%) = 100*(Vt – Vb) / V

em que:

d é o desvio em %

Vt é a tensão de cadeia superior

Vb é a tensão de cadeia inferior

V é a tensão da bateria (V = Vt + Vb)

5.2.2 Configuração do nível de alarme:

Em caso de baterias VRLA (gel ou AGM), a gaseificação por sobrecarga

seca o eletrólito, aumentando a resistência interna e acabando por

provocar danos irreversíveis. As baterias VRLA de placa lisa começam a

perder energia quando a tensão de carga se aproxima dos 15V (bateria de

12V).

Incluindo uma margem de segurança, o desvio do ponto médio deve ser

inferior a 2% durante a carga.

Quando, por exemplo, se carregar um banco de baterias de 24V com uma

tensão de absorção de 28,8V, um desvio do ponto médio de 2% resulta

em:

Vt = V*d/100* + Vb = V*d/100 + V – Vt

Portanto:

Vt = (V*(1+d/100) / 2 = 28,8*1,02 / 2 ≈ 14,7V

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Victron batterij monitor BMV 702 Manual

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